Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Debt Securities, Available-for-sale [Abstract]

Schedule of marketable securities

The following is a summary of amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current).

(Millions)	September 30, 2021		December 31, 2020
Corporate debt securities	$	—	$	7
Commercial paper	501		237
Certificates of deposit/time deposits	45		31
U.S. treasury securities	305		125
U.S. municipal securities	4		4
Current marketable securities	855		404
U.S. municipal securities	30		30
Non-current marketable securities	30		30
Total marketable securities	$	885	$	434

Schedule of marketable securities by contractual maturity

The balances at September 30, 2021 for marketable securities by contractual maturity are shown below. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

(Millions)	September 30, 2021
Due in one year or less	$	855
Due after one year through five years	15
Due after five years through ten years	15
Total marketable securities	$	885